In a certain code language,
* 'A x B' means ‘A is the son of B’,
* 'A – B' means ‘A is the brother of B’,
* 'A + B' means ‘A is the wife of B’,
* 'A % B' means ‘A is the father of B’.

How is M related to T if the code expression is ‘M x N + P % S – T’?

Let us systematically decode the given relation expression step-by-step from left to right:
1. **$M\times N$:** $M$ is the son of $N$ ($M$ is Male).
2. **$N+P$:** $N$ is the wife of $P$. This means $N$ is Female and $P$ is Male. Consequently, $P$ is the father of $M$, and $N$ is the mother of $M$.
3. **$P\%S$:** $P$ is the father of $S$. Therefore, $M$ and $S$ are siblings sharing the same parents ($P$ and $N$).
4. **$S-T$:** $S$ is the brother of $T$. This tells us $S$ is Male, and $T$ is another sibling in the same family.

From this structure, $M,S,\text{ and }T$ are all children of the couple $P$ (father) and $N$ (mother). Since $M$ is specified as a son (Male), $M$ must be the brother of $T$.